According to the schematic, they are 15mm center to center. Initially, I set my offsets to -7.5 and 7.5. That seemed logical, but then my prints were offset. So, I set ext0 to 0,0, and ext1 to 15,0. So far, it seems to be slicing and printing correctly.

Staff Member

Offset is 18mm, and it is pretty damn accurately 18mm too. I don't expect you'd see more than 0.05mm variation in offset between parts., those holes are very very tightly toleranced in order to ensure thermal contact between the breaks and the sink. A nice side effect of this is that there is nearly no wiggle room for the breaks to shift in the sink in the XY plane and deviate from the 18mm separation.

As Mike says how straight and tram you mount it will have a critical effect on your actual offsets in XY, much more so than the hotend itself.

I'm sorry that the drawings and docs aren't up and available, that's an oversight on our part and I'll try and get that fixed ASAP.